In 1988 HYDRA 5 for DOS was released. Optional modules linked to dBASE database and AutoCAD,
for the sewer modeling industry's first GIS integration.

HydraGraphics version 1, released in 1993 was a stand-alone GIS interface for DOS HYDRA.
It was also the first sewer model for the Microsoft Windows operating system. Version 2 and 3 made incremental improvements.

HYDRA 6, released in 1998, eliminated the DOS components of the programs. Versions 6.1 to 6.4
made incremental improvements.

HYDRA 7, released in 2010, is a complete re-build of the interface using the latest design elements
and development platform. It is a stand-alone analytical geodatabase, using scenario-oriented project organization.
Available by digital download.